Document Detail

Combinatorial approach to the development of a single mass YVO(4):Bi(3+),Eu(3+) phosphor with red and green dual colors for high color rendering white light-emitting diodes.
MedLine Citation:
PMID:  20560596     Owner:  NLM     Status:  MEDLINE    
Instead of developing a novel red phosphor individually, this work proposes the production of white light by combining a near-ultraviolet/ultraviolet diode chip with blue and special yellow phosphors: the yellow phosphor includes the red and green components with high color saturation. The availability of this scheme is demonstrated by preparing a white light-emitting diode (WLED) with color rendering index (Ra) up to 90.3. The desired single-mass yellow phosphor is successfully screened out from the YVO(4):Bi(3+),Eu(3+) system by using a combinatorial chemistry approach. When the emission color and luminous efficiency are both considered, the best composition for producing white light is (Y(1-s-t)Bi(s)Eu(t))VO(4) with 0.040 < or = s < or = 0.050 and 0 < t < or = 0.015. The red component that is required for a high-Ra WLED is obtained through sensitizing luminescence of Eu(3+) by Bi(3+) in a YVO(4) host; meanwhile, both Bi(3+) and Eu(3+) emission are improved by keeping the Bi(3+) and Eu(3+) contents close to the critical concentration.
Lei Chen; Kuo-Ju Chen; Chun-Che Lin; Cheng-I Chu; Shu-Fen Hu; Min-Hung Lee; Ru-Shi Liu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of combinatorial chemistry     Volume:  12     ISSN:  1520-4774     ISO Abbreviation:  J Comb Chem     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-07-29     Completed Date:  2010-11-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100886263     Medline TA:  J Comb Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  587-94     Citation Subset:  IM    
Department of Chemistry, National Taiwan University, Taipei, Taiwan.
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MeSH Terms
Bismuth / chemistry*
Combinatorial Chemistry Techniques*
Europium / chemistry*
Phosphorus / chemistry*
Small Molecule Libraries
Vanadium Compounds / chemistry*
Yttrium / chemistry*
Reg. No./Substance:
0/Small Molecule Libraries; 0/Vanadium Compounds; 7440-53-1/Europium; 7440-65-5/Yttrium; 7440-69-9/Bismuth; 7723-14-0/Phosphorus

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